It looks like even President Obama has taken notice of Treasury nominee Jack Lew's loop signature. During the personnel announcement in the East Room of the White House today, the president poked fun at Lew for his autograph, which resembles a long string of loops.

"I had never noticed Jack's signature, and when this was highlighted yesterday in the press, I considered rescinding my offer to appoint him," Obama joked.

"Jack assures me that he is going to work to make at least one letter legible in order not to debase our currency."

Lew's signature, which will be featured on every new U.S. dollar bill if he is confirmed as Treasury secretary, came to light Wednesday as reporters highlighted the current chief of staff's eccentric and illegible signature.

Treasury secretaries in the past, such as Timothy Geithner and John Snow, have tried to enhance the legibility of their signatures before hitting the dollar bills, but it's unclear whether Lew will reform his autograph or continue with the loops.